Datasheet

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LT1206

1206fb

Typical applicaTion

FeaTures DescripTion

250mA/60MHz Current

Feedback Amplifier

The LT

1206 is a current feedback amplifier with high output

current drive capability and excellent video characteristics.

The LT1206 is stable with large capacitive loads, and can

easily supply the large currents required by the capacitive

loading. A shutdown feature switches the device into a

high impedance, low current mode, reducing dissipation

when the device is not in use. For lower bandwidth ap-

plications, the supply current can be reduced with a single

external resistor. The low differential gain and phase, wide

bandwidth, and the 250mA minimum output current drive

make the LT1206 well suited to drive multiple cables in

video systems.

The LT1206 is manufactured on Linear Technology’s pro-

prietary complementary bipolar process.

L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear

Technology Corporation. All other trademarks are the property of their respective owners.

Noninverting Amplifier with Shutdown

applicaTions

250mA Minimum Output Drive Current

60MHz Bandwidth, A

= 2, R

= 100Ω

900V/µs Slew Rate, A

= 2, R

= 50Ω

0.02% Differential Gain, A

= 2, R

= 30Ω

0.17° Differential Phase, A

= 2, R

= 30Ω

High Input Impedance, 10MΩ

Wide Supply Range, ±5V to ±15V

Shutdown Mode: I

< 200µA

Adjustable Supply Current

Stable with C

= 10,000p

Available in 8-Pin DIP and SO and 7-Pin DD and

TO-220 Packages

Video Amplifiers

Cable Drivers

RGB Amplifiers

Test Equipment Amplifiers

Buffers

Large-Signal Response, C

= 10,000pF

–

LT1206

S/D**

15V

–15V

COMP

0.01µF*

24k

15V

ENABLE

OUT

OPTIONAL, USE WITH CAPACITIVE LOADS

GROUND SHUTDOWN PIN FOR

NORMAL OPERATION

1206 TA01

COMP

74C906

= ±15V

= R

= 3k

= ∞

500ns/DIV

1206 TA01b

Summary of content (18 pages)

PAGE 1
LT1206 250mA/60MHz Current Feedback Amplifier Features Description 250mA Minimum Output Drive Current 60MHz Bandwidth, AV = 2, RL = 100Ω 900V/µs Slew Rate, AV = 2, RL = 50Ω 0.02% Differential Gain, AV = 2, RL = 30Ω 0.
PAGE 2
LT1206 Absolute Maximum Ratings (Note 1) Supply Voltage......................................................... ±18V Input Current......................................................... ±15mA Output Short-Circuit Duration (Note 2).......... Continuous Specified Temperature Range (Note 3)......... 0°C to 70°C Operating Temperature Range..................–40°C to 85°C Junction Temperature............................................ 150°C Storage Temperature Range...................
PAGE 3
LT1206 Electrical Characteristics The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VCM = 0, ±5V ≤ VS ≤ 15V, pulse tested, VS/D = 0V, unless otherwise noted.
PAGE 4
LT1206 Small-Signal Bandwidth IS = 20mA Typical, Peaking ≤ 0.1dB AV RL RF RG –3dB BW (MHz) –0.1dB BW (MHz) VS = ±5V, RS/D = 0Ω AV RL RF RG –3dB BW (MHz) –0.1dB BW (MHz) VS = ±15V, RS/D = 0Ω –1 150 30 10 562 649 732 562 649 732 48 34 22 21.4 17 12.5 –1 150 30 10 681 768 887 681 768 887 50 35 24 19.2 17 12.3 1 150 30 10 619 715 806 – – – 54 36 22.4 22.3 17.5 11.5 1 150 30 10 768 909 1k – – – 66 37 23 22.4 17.5 12 2 150 30 10 576 649 750 576 649 750 48 35 22.4 20.
PAGE 5
LT1206 Typical Performance Characteristics PEAKING ≤ 0.5dB PEAKING ≤ 5dB –3dB BANDWIDTH (MHz) 80 RF = 470Ω 70 RF = 560Ω 60 RF = 680Ω 50 40 RF = 750Ω 30 RF = 1k 20 10 40 RF = 560Ω 30 RF = 750Ω 20 RF = 1k RF = 2k 10 16 14 12 10 8 SUPPLY VOLTAGE (±V) 6 100 0 18 4 16 14 12 10 8 SUPPLY VOLTAGE (±V) 6 RF =390Ω RF = 330Ω 50 40 RF = 470Ω 30 RF = 680Ω 20 10 50 – 3dB BANDWIDTH (MHz) 70 10k AV = 10 RL = 10Ω PEAKING ≤ 0.
PAGE 6
LT1206 Typical Performance Characteristics Supply Current vs Ambient Temperature, VS = ±5V 24 VS/D = 0V TJ = –40°C 20 TJ = 25°C 18 16 TJ = 85°C 14 TJ = 125°C 12 10 RSD = 0Ω 20 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) 22 25 4 16 14 12 10 8 SUPPLY VOLTAGE (±V) 6 15 RSD = 10.2k 10 RSD = 22.1k 5 0 –50 –25 18 50 25 0 75 TEMPERATURE (C) 100 COMMON-MODE RANGE (V) SUPPLY CURRENT (mA) 12 10 8 6 4 100 300 400 200 SHUTDOWN PIN CURRENT (µA) –1.5 –2.0 2.0 1.5 1.
PAGE 7
LT1206 Typical Performance Characteristics Output Impedance in Shutdown vs Frequency Output Impedance vs Frequency 100k RS/D = 121k 10 RS/D = 0Ω 1 0.
PAGE 8
LT1206 Simplified Schematic V+ TO ALL CURRENT SOURCES Q5 Q10 Q2 Q18 Q17 D1 Q6 Q1 Q9 V– 1.25k +IN SHUTDOWN Q11 Q15 CC –IN V– 50Ω COMP RC OUTPUT V+ V+ Q12 Q3 Q8 Q16 Q14 D2 Q4 Q13 Q7 V– 1206 SS Applications Information The LT1206 is a current feedback amplifier with high output current drive capability. The device is stable with large capacitive loads and can easily supply the high currents required by capacitive loads.
PAGE 9
LT1206 Applications Information 12 VS = ±15V 10 RF = 1.2k COMPENSATION VOLTAGE GAIN (dB) 8 6 4 RF = 2k NO COMPENSATION 2 0 RF = 2k COMPENSATION –2 –4 –6 –8 1 10 FREQUENCY (MHz) 100 1206 F01 Figure 1 is flat to 0.35dB to 30MHz. The network has the greatest effect for CL in the range of 0pF to 1000pF. The graph of Maximum Capacitive Load vs Feedback Resistor can be used to select the appropriate value of feedback resistor. The values shown are for 0.
PAGE 10
LT1206 Applications Information For applications where the full bandwidth of the amplifier is not required, the quiescent current of the device may be reduced by connecting a resistor from the shutdown pin to ground. The quiescent current will be approximately 40 times the current in the shutdown pin. The voltage across the resistor in this condition is V + – 3VBE. For example, a 60k resistor will set the quiescent supply current to 10mA with VS = ±15V.
PAGE 11
LT1206 Applications Information the maximum allowable input voltage. To allow for some margin, it is recommended that the input signal be less than ±5V when the device is shut down. Capacitance on the Inverting Input RF = 750Ω RL = 50Ω 20ns/DIV 1206 F05c Figure 5c. Large-Signal Response, AV = 2 When the LT1206 is used to drive capacitive loads, the available output current can limit the overall slew rate. In the fastest configuration, the LT1206 is capable of a slew rate of over 1V/ns.
PAGE 12
LT1206 Applications Information power plane layer either inside or on the opposite side of the board. Although the actual thermal resistance of the PCB material is high, the length/area ratio of the thermal resistance between the layer is small. Copper board stiffeners and plated through holes can also be used to spread the heat generated by the device. Tables 1 and 2 list thermal resistance for each package.
PAGE 13
LT1206 Applications Information Precision ×10 Hi Current Amplifier CMOS Logic to Shutdown Interface 15V + + LT1097 LT1206 COMP – S/D – + OUT 330Ω 24k LT1206 S/D – 0.01µF 500pF 5V 3k 1206 TA03 –15V 10k 2N3904 10k 1206 TA02 OUTPUT OFFSET: < 500µV SLEW RATE: 2V/µs BANDWIDTH: 4MHz STABLE WITH CL < 10nF 1k Low Noise ×10 Buffered Line Driver 15V 1µF + 75Ω + LT1115 – 1µF – 1µF 68pF 560Ω –15V 0.
PAGE 14
LT1206 Package Description N8 Package 8-Lead PDIP (Narrow .300 Inch) (Reference LTC DWG # 05-08-1510) .400* (10.160) MAX 8 7 6 5 1 2 3 4 .255 ± .015* (6.477 ± 0.381) .300 – .325 (7.620 – 8.255) .008 – .015 (0.203 – 0.381) ( +.035 .325 –.015 8.255 +0.889 –0.381 ) .045 – .065 (1.143 – 1.651) .065 (1.651) TYP .100 (2.54) BSC .130 ± .005 (3.302 ± 0.127) .120 (3.048) .020 MIN (0.508) MIN .018 ± .003 (0.457 ± 0.076) N8 1002 NOTE: 1.
PAGE 15
LT1206 Package Description R Package Package 7-Lead R Plastic DD Pak Plastic DD Pak Rev E) (Reference7-Lead LTC DWG # 05-08-1462 (Reference LTC DWG # 05-08-1462 Rev E) .256 (6.502) .060 (1.524) TYP .060 (1.524) .390 – .415 (9.906 – 10.541) .165 – .180 (4.191 – 4.572) .045 – .055 (1.143 – 1.397) 15° TYP .060 (1.524) .183 (4.648) +.008 .004 –.004 +0.203 0.102 –0.102 .059 (1.499) TYP .330 – .370 (8.382 – 9.398) ( ) .095 – .115 (2.413 – 2.921) .075 (1.905) .300 (7.620) +.012 .143 –.020 +0.
PAGE 16
LT1206 Package Description S8 Package 8-Lead Plastic Small Outline (Narrow .150 Inch) (Reference LTC DWG # 05-08-1610) .189 – .197 (4.801 – 5.004) NOTE 3 .045 ±.005 .050 BSC 8 .245 MIN .160 ±.005 7 6 .150 – .157 (3.810 – 3.988) NOTE 3 .228 – .244 (5.791 – 6.197) .030 ±.005 TYP 1 RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) 3 2 .053 – .069 (1.346 – 1.752) .008 – .010 (0.203 – 0.254) 5 .004 – .010 (0.101 – 0.254) 0°– 8° TYP .016 – .050 (0.406 – 1.270) .050 (1.
PAGE 17
LT1206 Revision History (Revision history begins at Rev B) REV DATE DESCRIPTION PAGE NUMBER B 3/11 Updated note on Table 2 in the Applications Information section. 12 1206fb Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
PAGE 18
LT1206 Related Parts PART NUMBER DESCRIPTION COMMENTS LT1010 High Speed Buffer High Power, High Speed Buffer LT1207 Dual 250mA Out, 900V/µs, 60MHz Current Feedback Amplifier Adjustable Supply Current, Shutdown LT1210 1.1A, 35MHz, 900V/µs Current Feedback Amplifier Adjustable Supply Current, Shutdown LT1395 Single 400MHz Current Feedback Amplifier 0.1dB Gain Flatness to 100MHz LT1815 6.5mA, 220MHz, 1.